#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
#  Copyright 2016-2017 China Telecommunication Co., Ltd.
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.
#

import threading

### ###########################################################
# Decorator to threading lock a function
#


class locktan(object):
    lock = threading.RLock()

    def __call__(self, fn):
        def lockfn(*args, **kwargs):
            locktan.lock.acquire()
            try:
                result = fn(*args, **kwargs)
            except:
                raise
            finally:
                locktan.lock.release()
            return result
        return lockfn
